AutoCodes – GMC – U01A1 2014 GMC Sierra

U01A1 2014 GMC Sierra Code - Lost Communication with Hybrid/EV Battery Interface Control Module 2

Quick Answer

This diagnostic monitors the internal battery communication status between the Hybrid/EV Powertrain Control Module 2 and the Hybrid/EV Battery Interface Control Modules. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U01A1 2014 GMC Sierra indicates Lost Communication with Hybrid/EV Battery Interface Control Module 2.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 251

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U01A1 2014 GMC Sierra Description

This diagnostic monitors the internal battery communication status between the Hybrid/EV Powertrain Control Module 2 and the Hybrid/EV Battery Interface Control Modules. The diagnostic monitors Hybrid/EV Battery Interface Control Modules data availability whenever this private communications bus is active. The communication network between Hybrid/EV Powertrain Control Module 2 and Hybrid/EV Battery Interface Control Modules is in a daisy-chain architecture. Therefore, a break at any point in the communication bus results in a loss of Hybrid/EV Battery Interface Control Modules communication with the Hybrid/EV Powertrain Control Module 2. If any data is received, the diagnostic will report a pass. If no data is received for greater than 4.5 s, the Hybrid/EV Powertrain Control Module 2 will attempt to initiate the Hybrid/EV Battery Interface Control Modules into a communication mode where the Hybrid/EV Battery Interface Control Modules can perform their own internal communication loop back, bypassing the daisy-chain. If this is the first Hybrid/EV Battery Interface Control Module in the daisy-chain that the Hybrid/EV Powertrain Control Module 2 cannot re-establish communication with, this diagnostic will fail. The Diagnostic Trouble Code (DTC) will be set when the Hybrid/EV Powertrain Control Module 2 has not received data from the Hybrid/EV Battery Interface Control Module 2 for more than 4.5 s.

OBDII Code U01A1 2014 GMC Sierra - Lost Communication with Hybrid/EV Battery Interface Control Module 2 - AutoCodes.com — U01A1 2014 GMC Sierra Code - Lost Communication with Hybrid/EV Battery Interface Control Module 2

What does this mean?

What are the Possible Causes of the DTC U01A1 2014 GMC Sierra?

Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC U01A1 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U01A1 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U01A1 2014 GMC Sierra code?

Need more information on how to fix the U01A1 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U01A1 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U01A1 2014 GMC Sierra Code

1. What are common symptoms of OBDII code U01A1 in a 2014 GMC Sierra indicating a lost communication with Hybrid/EV Battery Interface Control Module 2?

- Common symptoms include the check engine light coming on, reduced fuel efficiency, and possible issues with hybrid/EV system performance.

2. What are some possible causes of OBDII code U01A1 in a 2014 GMC Sierra?

- Possible causes include a faulty Hybrid/EV Battery Interface Control Module 2, damaged wiring or connectors, software issues, or a malfunction in the hybrid/EV system.

3. How can I diagnose the issue related to OBDII code U01A1 in my 2014 GMC Sierra?

- Diagnosing the problem may require specialized diagnostic tools to communicate with the hybrid/EV system. Checking for loose connections, damaged wiring, and ensuring software is up to date are good starting points.

4. Can I still drive my 2014 GMC Sierra with the U01A1 code present?

- It is not recommended to continue driving the vehicle with the U01A1 code present, as it can lead to further damage or performance issues in the hybrid/EV system.

5. How can I reset the OBDII code U01A1 in my 2014 GMC Sierra?

- Resetting the code typically involves using a diagnostic scanner to clear the code after addressing the underlying issue. However, if the problem persists, the code may reappear.

6. Is it safe to attempt repairs for OBDII code U01A1 in my 2014 GMC Sierra on my own?

- Repairing issues related to the hybrid/EV system can be complex and may require specialized knowledge and tools. It is recommended to seek professional help to avoid further complications.

7. How much does it cost to repair OBDII code U01A1 in a 2014 GMC Sierra?

- The cost of repairing the U01A1 code can vary depending on the exact cause of the issue. Costs may include parts replacement, labor, and diagnostic fees.

8. Can a low battery voltage trigger the U01A1 code in a 2014 GMC Sierra?

- Yes, low battery voltage can potentially disrupt communication with the Hybrid/EV Battery Interface Control Module 2 and trigger the U01A1 code.

9. Are there any preventative maintenance steps to avoid encountering the U01A1 code in a 2014 GMC Sierra?

- Regularly checking the hybrid/EV system components, ensuring proper battery maintenance, and promptly addressing any warning lights can help prevent issues that may trigger the U01A1 code.

10. How long does it typically take to repair the U01A1 code issue in a 2014 GMC Sierra?

- The repair time for the U01A1 code can vary depending on the exact cause of the problem, availability of parts, and the complexity of the repair. It is best to consult with a professional mechanic for a more accurate estimate.